Dentin Properties and Structure

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Dentin is continuously formed throughout life, while enamel is only formed during tooth development. (correct)
Dentin is formed only in childhood, while enamel continues to form throughout life.
Both dentin and enamel are formed during tooth development.
Both dentin and enamel stop forming after the tooth is fully developed.

<p>Dentin's permeability decreases when tubules are blocked. (C)</p> Signup and view all the answers

<p>Dentin is less hard than enamel but harder than cementum. (A)</p> Signup and view all the answers

Dentin is the mineralized tissue that makes up the bulk of a tooth, forming the shape.

Unlike enamel, dentin is sensitive due to its network of small tubes called dentinal tubules.

Dentin is continuously formed throughout life, unlike enamel which develops only during tooth formation.

Dentin is less hard than enamel, but harder than cementum and bone. It wears down faster than enamel.

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Dentin's high permeability, due to the dentinal tubules, allows for fluid flow and sensitivity. Blocking the tubules reduces permeability.

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Color: Yellowish, darkening with age
Thickness: Varies from 3-10 mm, potentially more
Elasticity: High degree of elasticity; acts as a shock absorber for overlying enamel, explaining "undermined enamel"
Hardness: Less hard than enamel but harder than cementum and bone; wears faster than enamel; harder in the center of the tooth compared to the periphery
Radio Density: More radiolucent than enamel, more radio-opaque than cementum
Permeability: Highly permeable due to dentinal tubules; permeability decreases when tubules are blocked